I suggest you ...

Allow to create group/reminder lists

I tend to lose track of all the different places I'd like to go to and the ability to somehow organize the places marked as 'want to go' would be fantastic.
I'm thinking of a feature that allows users to create lists on certain topics. For example a list for 'cocktail bars to visit next week/month' or 'suggestions for friends birthday'.
These lists would be perfect reminders and help to keep track of places to go to.